Trevor Traina, Traina Interactive: The son of San Francisco socialite Dede Wilsey worked at Microsoft and founded several startups. He's a link between San Francisco's older elites and the tech nouveau riche.

Dion Lim, education startup CEO: Lim hasn't revealed the name of his latest venture yet. He's close to dinner host Tolia; the two cofounded Round Zero, a business-networking group popular in the dotcom era, and Epinions, a product-reviews site.

Nirav Tolia, CEO, Nextdoor: Tolia was the face of Yahoo in the '90s, frequently appearing on TV to promote properties like Yahoo Finance. He now runs Nextdoor, a private social network for neighborhoods.

Jeremy Stoppelman, CEO, Yelp: Mayer, an early and enthusiastic user of Yelp, tried to buy the local-business-reviews site when she worked at Google.

Michael Birch, cofounder, Bebo: After selling his social network to AOL for $850 million, Birch now focuses on nonprofit efforts like Charity:Water and running a startup incubator.

Jony Ive, SVP, Apple: After executive Scott Forstall's departure, Ive gained oversight over Apple's software design as well as its hardware products. As such, he's a critical contact for pretty much everyone in the room.

Marissa Mayer, CEO, Yahoo: She has work or personal connections to almost everyone in this room.

Bret Taylor, CEO, Quip: The former CTO of Facebook is now running a stealth startup.

My speculation: Yahoo will buy at least one company in the room this year.

These CEO dinners, it seems, are one of the tech world's open secrets. There's a regular crew, centered around Nextdoor CEO Nirav Tolia and Google executive Mike Cassidy. Both Tolia and Cassidy, as it happens, have been entrepreneurs-in-residence atBenchmark Capital.

A March 2012 profile of Tolia mentions a "supper club" of influential tech figures. This appears to be the fruition of that plan.

Tolia is a veteran networker, having cofounded a less hoity-toity business-networking group, Round Zero, which flourished during the first dotcom boom. He subsequently drew scrutiny for making up an academic degree and a stint at McKinsey on his resume, which led him to step down from his job as COO of Shopping.com, a product-search company later acquired by eBay. That blot on his career history, which led him to spend a few years in exile from the tech world in the middle of the past decade, has not hurt him with Silicon Valley insiders.